[PATCH] media: saa7164: fix cleanup on resource allocation failure

[Guangshuo Li]

saa7164_dev_setup() adds the device to the global saa7164_devlist before
requesting the PCI BAR memory regions.

If get_resources() fails, saa7164_dev_setup() decrements the device count
and returns an error, but leaves the device on saa7164_devlist. The probe
error path then frees the device, leaving a dangling entry on the global
list.

Remove the device from saa7164_devlist before returning from the
get_resources() failure path, matching the cleanup done by the ioremap
failure paths.

Also release BAR0 if BAR0 was successfully requested but the BAR2
request fails.

Fixes: 443c1228d505 ("V4L/DVB (12923): SAA7164: Add support for the NXP SAA7164 silicon")
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/media/pci/saa7164/saa7164-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/pci/saa7164/saa7164-core.c b/drivers/media/pci/saa7164/saa7164-core.c
index 6bcde506adf5..225dbd3650da 100644
--- a/drivers/media/pci/saa7164/saa7164-core.c
+++ b/drivers/media/pci/saa7164/saa7164-core.c
@@ -878,6 +878,9 @@ static int get_resources(struct saa7164_dev *dev)
 		if (request_mem_region(pci_resource_start(dev->pci, 2),
 			pci_resource_len(dev->pci, 2), dev->name))
 			return 0;
+
+		release_mem_region(pci_resource_start(dev->pci, 0),
+				   pci_resource_len(dev->pci, 0));
 	}
 
 	printk(KERN_ERR "%s: can't get MMIO memory @ 0x%llx or 0x%llx\n",
@@ -999,6 +1002,9 @@ static int saa7164_dev_setup(struct saa7164_dev *dev)
 		printk(KERN_ERR "CORE %s No more PCIe resources for subsystem: %04x:%04x\n",
 		       dev->name, dev->pci->subsystem_vendor,
 		       dev->pci->subsystem_device);
+		scoped_guard(mutex, &devlist) {
+			list_del(&dev->devlist);
+		}
 
 		saa7164_devcount--;
 		return -ENODEV;
-- 
2.43.0